they looked the same on both sides. i beieve it could be the shifter holder bolt is losse up top. the one that holds forward nuetral and reverse in placeSome of those shifter dogs have a groove cut into the end that must face forward. It can physically be reversed BUT will not function properly. I don't recall if your model engine is one of them or not... did you notice any grooves on one end?
HI randy. Welcome to iboats. Does the armature plate found beneath the flywheel rotate out of way when the throttle is twisted into the STOP position? How about REV, can you shift in/out ok, or is it on the Fritz too? One simple thing you might check is the shift shaft linkage to see if it is connected properly. If that doesn't do it, you may have to open the gear case again to inspect the clutch dog and gears. Here are some handy links.
Maintaining Johnson E & FD Serie
1964 Evinrude 18403 18 hp Outboard Motor Parts